(314) 
Grossularia hesperia Trichostema Parishu 
Grossularia Parishu Sphacele fragrans 
* Adenostoma sparsifolium *Diplacus longiflorus 
Rosa Alderson Diplacus puniceus 
* Xylothermia montana tomentosa  Pentstemon cordifolius 
Lupinus longifolius * Penstemon ternatus 
Lupinus Halli Pentstemon antirrhinoides 
Rhamnus pilosa Lonicera subspicata denudata 
Ceanothus spinosus Ericameria cuneata spathulata 
Ceanothus divaricatus eglandu- Ericameria Parishu 
losus Baccharis Plummerae 
Ceanothus oliganthus 
The species designated by an asterisk (*) are restricted to the 
southern part of the district. 
The general character of the vegetation is typical of a warm 
temperate climate which possesses moist cool winters and hot 
dry summers. The predominant plants are evergreen xerophyllous 
shrubs with small thick leathery leaves of a dull or grayish-green 
color. They are invariably stiff compact growers, forming im- 
penetrable thickets that spread over the mountainsides in almost 
unbroken masses for many miles. 
The diversity of the flora, however, is considerable. ‘The prox- 
imity of the sea and the irregularities of the topography, together 
with the resultant climatic conditions, are factors that have aided 
in the development of several sub-districts with distinctive floral 
features. ‘Three of these floral sub-districts are recognized: the 
Littoral, the Coastal, and the Interior. The first of these sub- 
districts is the territory the within immediate influence of the sea, 
the second comprises the fog belt, and the third the chaparral 
belt of the interior mountains and foothills which are more or 
less cut off from the direct influence of the sea-breeze by hills or 
low mountains. Where passes or other connections exist between 
the Interior and the Coastal Sub-district the floral changes are 
gradual and difficult to separate. 
The Littoral Sub-district is confined to the immediate proximity 
of the sea, and is composed of four formations: the beach, the 
sand-dune, the salt-marsh, and the bluff. ‘The number of shrubby 
plants wholly limited to this sub-district is small, Eriogonum 
parvifolium, Lupinus Chamissonis, and Ericameria ericoides on 
the sand-dunes, and Atriplex Breweri on the bluffs and edges of 
